Phase Changes - a reversable physical change from one state to another
-A. Melting, freezing, vaporization, condensation, deposition, sublimination
-B. Temperature always remains constant during a phase change
Energy is either released or absorbed
Endothermic - absorbing energy (melting ice to water
Exothermic - energy is released (freezing water to ice)
Evaporation - when a gas gains enough energy at temperatures far below boiling to escape from a liquid
Boiling - takes place throughout the entire liquid
Condensation - when a gas becomes a liquid
Sublimation - the process of going directly from solid to gas
Deposition - when a gas vapor goes directly into a solid state
| Description of Phase Change | Term for Phase Change | Heat Movement During Phase Change |
|---|---|---|
| Solid to Liquid | Melting | Heat goes into the object |
| Liquid to Solid | Freezing | Energy leaves the object |
| Liquid to Gas | vaporization, including boiling and evaporation | Heat goes into the liquid as it vaporizes |
| Gas to Liquid | Condensation | Heat leaves the gas as it condenses |
| Solid to Gas | Sublimation | Heat goes into the solid as it subliminates |